Today's beta, build 14F25a, can be downloaded through the Software Update mechanism in the Mac App Store or through the Apple Developer Center.

The first and second OS X 10.10.5 betas did not appear to include any consumer-facing changes, so it's likely that this update focuses on behind-the-scenes bug fixes and performance enhancements. OS X 10.10.5 beta 2 introduced a fix for the DYLD_PRINT_TO_FILE exploit that's been making headlines over the last few days, and the security flaw will be patched as soon as OS X 10.10.5 is released to the public.

Because we're just a couple of months away from the public release of OS X 10.11 El Capitan, OS X 10.10.5 will likely be one of the last updates to Yosemite, designed to prepare the operating system for its imminent retirement. It will, of course, continue to get bug fixes and minor repairs even after El Capitan's release to patch security flaws and fix other issues.

Over the course of its lifespan, OS X Yosemite has received four updates. The first two brought bug fixes and security improvements, while OS X 10.10.3, the most significant update to Yosemite, introduced the new Photos app, Force Touch APIs, new emoji features, and more.

I do not think apple should roll out new versions of os x every year. they should stay focused on stability and quality. only release software when it is stable and ready. this drive to come up with new things to put into os x every year is going to complicate the mac experience.

I haven't. I work for a small company that specializes in export. We have 10 computers with windows 7 which I almost never ever use. I have the privilege of being able to use my own computer. I understand what you mean and where you're coming from, and I may be very well completely wrong, but having said that, the Yosemite HAS been a complete mess, they have been many updates that didn't resolve a lot of issues and there have been COUNTLESS betas of the .1 updates (almost even more than El Capitan betas) so it just seemed to me that concentrating on El Capitan and leaving Yosemite at 10.10.4 was a good idea. Especially considering the fact that i really doubt 10.10.5 will be a completely different system and all the issues will be resolved. Knowing Apple we all know they are DYING for you to update to El Cap as soon as its released. I'm not inviting everyone to install the BETA of El Capitan, especially in work environments.

It's ironic that now that Yosemite is finally smooth and relatively bug free, here comes El Cap with a good deal of to be expected bugs. Not sure that is really going to be progress. Seems like they have to break things in order to move forward all the time. Don't quite get why...

This is how it's always been, you just didn't know about it because betas were closed and you were not allowed to talk about the betas publicly if you were a tester. Now that the public are beta testers for OS X people are shocked at how unstable a beta is and think that Apple has lost it's touch. They haven't. That's the very nature of beta software. I have been a beta tester for the last several releases of Parallels and while using the beta I can't post anything about it, but believe me, they were just as wonky and broke previously working functionality every bit as much as what we are seeing with OS X.

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